Windshield wiper



June 24, 41930. Y w. H. FARR I A 1,766,988

wINDsrELD wIPExi Filed-Jan. le', 1928 2 sheets-sheet 1 Jupe 24, 1930. w.H. FAHR 1,766,988

wINDsHIELD wIPER Filed Jan. 16. 1928 2 Sheets-Sheet 2 Patented June 24,1930 `UNI'IED STATES PATENr oFFIcl-z WILLABD E. FARB', 0F CHICAGO,ILLINOIS, ASSIGNOB T0 STEWART-WARNER COR- PORATION, F CHICAGO, ILLINOIS,A. CORPORATIQN 0F VIRGINIA WINDSHIELD WIPER Application med January 1e,192s. serial No. 247,029.

The purpose of this invention is to rovide an improved construction owmdshield wiper and the like adapted to be mounted on the windshield ofa motor vehicle and` be operated by suction derived from any convenientsource as from the engine. It consists in the elements and features ofconstruction shown and described as indicated in the claims. In thedrawings Figure 1 is a rear side elevation of a device embodying thisinvention shown mounted on. the rear or inner side of the windshield tobe served.

Figure 2 is a section at the line 2--2 on Fi re 1.

igure 3 is a section at the line 3-3 on Fi re 2.

igure 4 is a detail section at the vline 4-4 on Figure 2. i

Fi re 5 is a section at the plane indicate by the line 5-5 on Figure 2,certain parts being broken away to show the valve device.

Figure 6 is a `detail section at the plane indicated by the line 6---6on Figure 2 showing the vvalve seat stripped of all co-operating parts.

Figure 7 is an enlarged dissected perspective view of the valve devicewhich co-opcrates with the valve seat shown in Figure 6.

In the structure shown in the drawings the upper 4frame bar of thewindshieldis indicated at 10. The Wiper-operating structure comprisestwo cylinders, 20, 20, each open to atmosphere at one end and closed atthe -other end, said cylinders being mounted in axial alignment withtheir open ends proximate and occupied by a junction member, 21, whichalso serves vfor securing ing three notches, 21, across the ange; Iandeach cylinder has its open end which is to be engaged by the junctionmember diametered for entering and snugly fitting Within the flange,21h, and having struck out from the end three lugs, 20a, positioned forregistering with the notches, 2l, when the end' of the'cylinder isinserted within the iange, 21a, said lugs being slightly inclined to theaxis of the cylinder, so that upon engaging one end ofthe lug, behindthe flange of the junction member, 21, and

rotating the cylinder to carry the lug into the groove, 21, the cylinderis drawn tight? 1y into the junction member as the rotation of thecylinder carries the lug clear of the notch in which it was entered. Thejunction member, 21, has an interiorly project-l ing boss, 32, and anexteriorly projecting boss, 33, from which latter a'boss, 34, projectstangentially with respect to the cylinder. The interior boss, 32,. issegmentahin form, having `a iiat face, 35, constituting avalve seat, 35,at a portion of said fiat face from which a duet, 37, is formed extend-.ing substantially radially with respect to the cylinder through saidboss, 32, and into the boss, 34, where it is intersected by aa duct, 38,formed in said boss, 34, by vlboring in from the end of said boss, andsaid duct, 38, is intersected `by a third duet, 39, bored into the boss,34, parallel to the axis of the cylinder, whereby a continuouscommunicat1on is formed through the ducts, 39, 38 and 37, from theoutside of the cylinders to said valve seat.

A nip le, 40, adapted to receive a small tube to be telescoped onto itis fitted into the end of the duct, 39, and the duct, 38, is bored atthe outer end to receive a cut-off valve member, 41, screwed into saidduct and having its valve end fitting in the duct, 38, for cutting oilthe communication from. the nipple, 40, to the valve seat, 35a. Theboss, 32 is bored from opposite sides toward the middle point, the bores42, 42 stopping short of the duct, 37, and each adapted'to receive aslender tube, 60, which is therein rigidly secured to the junctionmember, the two tubular members, 60, projecting thus in 109 oppositedirections from said 'unction member toward the closed ends o thecylinders' respectively and terminating open near said 1 moreparticularly hereinafter mentioned.

From the face, 35, of the boss, 32, within what is termed the valve seatarea thereof, there are formed at opposite sides of the duct, 37, shortducts, 47, 47, meeting respectively the inner ends of the bores 1nwhich' the tubular piston guides, 60, 60, are secured', asmentioned,`and constitutin continuations of the axial passages o saidguide members vfrom the remoteopen ends i thereof to-thefvalve seat.'For co-opera'ting with said valve'seat and with the three portstherein, as above described, there is provided a valve member', 50,which hasin its vseating face a recess, 51, having its widthsubstantiall equal to the diameterof said ports and its length sucientto span the middle port and either of the extreme ports, beingsubstantially equal, therefore, to the sum of the diameters of themiddle port and an extreme port plus the distance between 'said ports.For holding this valve on the valve seat and for operating it, there isprovided a valve vibrator, 100, which extends across the segment face,35, beingpivoted at its upper end by the engagement of a V-notch, 101,in said upper end with a V- projection, 321? with which the boss, 32, isprovided for ing retained in said pivotal engagement by means of a slot,102, with which said vibrator is provided in position to receive and beengaged by the wiper rock shaft, 80, hereinafter described. The vibratorisadapted to Yhold the valve, 50, in position for reciprocation on thevalve seat by means of a slot', 104, in the vibrator which is engaged bya boss, 5 5, projecting from the outer side of the valve, 50. Thetwopistons, 30, 30, are connected 'together for concurrent movement by aconnector, 70, which extends within the cylinders `past the junctionmember, 21, said connector 'being positioned :subst'antially. in 'thevertical diametric pla-ne of the cylinders and maintained in thatposition by the pistons which are prevented from rotating by ltheirguidance upon the tubular guides, 60, which, as indicated, by theirmounting in the segment boss, 32, are positioned transversely in theplane of the horizontal diameter of the cylinder and thereby nearly 90degrees around from said connector. As indicated by the description andthat purpose,4the vibrator beshowings of the tubes, 60,' they projectthrough the pistons beyond the limit of they outer position of thelatter, for communicating suction and atmospheric pressure alterbosses,32 and 33, at the forward, side of the cylindler, and in an` extendedcylindrical boss, 33*, which projects forwardly from the boss, adaptedto project through the upper' bar of the windshield, said boss, 34,being threaded for receiving at the outer side of said bar a nut, 335',for securing the entire device tothe windshield frame. The rock shaft,80, projects entirely through and beyond the end of said boss, 33x, forreceiving the wiper-carrying lever arm, 81, as seen in Figures 1 and 2.v g

The rock shaft, 80, carries inside the cyl*- inders and junction membera rocker, 80, which consists of two lever arms, 80", 80h, each having apin, 80c, projecting laterally near the end of the arm for engagingnotches, in the piston connector, 70, whereby in a manner readilyunderstood from the drawings, reciprocation of the connector, 70, rocksthe rocker, 80, and the rock shaft, 80, alternately in oppositedirections for swinging the wiper arm throu h any desired angle lessthan 180 degrees or wiping the 'glass :of the windshield.

Mounted slidingly in' the lower side of the avingl a lug, 110, to whichthere is connect- 'ed oneend of a compression spring, 62, the

by the piston in the completion o itsin-l stroke to av position at'whichthe lineA from one connection of the spring to the other has beencarried slightly past the position of alignment with the pivot of thevibrator, so that the'reaction of the spring from the compression towhich. it is subjected-in the' movement of the slide bar under-theimpulse of the piston operates to 'thrust the lowerend of the vibratortoward the piston which has just encountered and actuated the slide bar,and to thrust the slide bar still further in the direction in `which itwas thrust by .the piston for producing the compression of the springand the rocking of the valve .vibrator. Upon consideringthis`construct1on itwill be understood that the shifting of the lunctionmember there isl a slide bar, 110,.

valve which is effected by the rocking of the vibrator in the mannerdescribed, shifts the communication of the suction duct, 37 whose port,37a, at the valve seat is the middle of the three ports, 47, 37a, 47a,the port, 47a, which admitted suction to the end of the cylinder whosepiston under the action of the suction performedthe stroke in which CIJthe opposite piston shifted the communication by encountering the slide,100, causing the snap action; and that the snap action reversing thevalve position, and opening to atmosphere the port which was previouslyvconnected with the suction port, admits the suction to the other portcausing the other piston to make the reverse stroke, reproducing theinitial conditions and repeating the cycle of action described forgiving the wiper back-and-orth wiping movement over the windshieldglass. It should be understood that the term junction member? as appliedto the part, 21, in the foregoing description and in certain of theclaims, is not intended to define the function of that partl forsecuringtogether the cylinders between whose open ends it is interposed, butonly to indicate its relation for aiording continuity of structure. Andother or additional means may 'be employedV for secure- "my hand atshifting it, said valve vibrator having an aperture for the rock shaftelongated in the irection of the shifting movement of the valve forlimiting said shifting movement.

3. In the construction dened in Claim 1, the hollow rods being locatedeccentrically in the cylinders and with respect to the pistons, theoperating connection between the two pistons being also positionedeccentrica]- ly with respect to the cylinders and pistons, the radialplanes in which said hollow rods and piston -connections respectivelyare located being at right angles to each other.

4. In the construction defined in Claim 1, the end-to-end-hollow rodsbeing formed and positioned for guiding the pistons'.re

spectively in their reci rocation. f In testimony whereo have hereuntoset ligago, Illlnois, this 12th day of January,

/WILLARD H. FARB.

ment of the parts together, without departing from the invention.

.I claim:

. l. In a device for the` purpose indicated in combination with twocylinders disposed 1n axial alignment having their remote ends closedand open to atmosphere at their proximate ends, a junction member bywhich the cylinders are joined at their pistons reciprocably mounted insaid cylinders respectively, and means within the cylinders connectingthe two pistons for simultaneous reciprocation; an end-to-end-hollow rodextending in each cylinder from 'a point in the cylinder beyondtheoutward stroke of the piston therein through 'the pistons to thejunction member, the junction member having a duct open at one endexteriorly of said member and at that end adapted to be connected to asource of suction, and at the inner end arrangedfor communication withthe inner ends of said hollow rods; valve means for shifting saidcommunication of said ducts alternately from one to the other of saidhollow rods, and means actuated by the connection between the pistonsfor operating ,Said valve means .to shift said communication at thelimit of each stroke of the proximate ends; l

